Press for making wax patterns



' March 16, 1937. R PERKlNs 2,073,850

PRESS FOR MAKING WAX PATTERNS Filed June 24, 1956 Patented Mar. 16, 1937 umrto sures ears 2,073,850 mass toe MAkiNG WAX PATTERNS Clarence R'; Perkins, Tacoma, Wash.

Application Junee24,

. 8 Claims; This invention relates to devices for making the wax pattern from which a plaster mold may be made, said mold being used for casting the gold backings to be attached to the bridge on which artificial teeth are removably securedl The characteristic of this gold backing is that it has a vertical ridge in its center which acts as a key to receive and hold the artificial tooth, said key entering a previously formed complementary slot on the rear face of the said tooth. It is therefore necessary that the wax pattern be of thesame shape and form as the gold backing and it must,

therefore, have the correspondingvertical rib in its face. g

The object of my invention is to provide means for pressing the wax pattern from a sheet or wad of wax and simulaneously forming thereon the said vertical ridge. It is obvious that,.though the wax may be pressed into the desired form by simple pressure of the wax between suitable molds, the said molds cannot be vertically sepa-. rated without damaging or tearing away the said ridge in the wax and, therefore, it is an object of my invention to provide means whereby the molds can be pressed together to form the desired wax pattern and may then be slid horizontally, relative to each other, to permit the key ridge on the wax pattern to slide out of the slot in the mold, and thereby release the wax pattern from the mold having the slot therein.

. The invention further comprises means whereby the mold carriers are hinged together topermit a relative vertical movement; meansto lock them in this hinged relation and means to ;re-

3 lease them from such hingedrelation and tapermit only a relative limited sliding movement. I. attain these and other objects bythe devices and arrangements illustrated in the accompanying drawing, in which r v H v A Fig. 1 is a side view of my improved wax pattern press, showing the parts in the positions occu pied thereby when the wax is being pressed; Fig. 2 is a similar view of a portion thereof, showing one mold slid away from the other to re- 5 lease the pattern;

Fig. 3 is a side elevation of the upper member of the press, showing it in relation to the pivot pin when it has been slid backward, and showing a portion broken away to-reveal its construction; Fig. 4 is an end view of the shank of the upper I mold;

Fig. 5 is a side view of the said upper mold, removed from the press;

Fig. 6 is a bottom view thereof;

1936; Serial No. 87,005

(Cl; 18 5'L7) Fig. 'lis an enlarged front view of the said upper mold;

Fig. 8 is a side elevation of the pivot pin; and Fig. 9 is an enlarged front view of the lower mold. V Similar numerals of reference refer to similar parts throughout the several views The press comprises two main members, the lower or base member I being adapted to be secured to a suitable table or support, if desired, and carrying the lower mold, while the upper member 2 ishingedly secured to the said base member 8 and carries the upper mold.

The base member I is provided with two upward. extending ears 3 at its rear, and the upper member 2 is provided with a tongue 4 which fits between the said ears 3. A pivot pin 5 passes horizontally and transversely through the said ears.3 and tongue 4, and is provided with a handle 6 at one end. I'his pin 5 has a portion 'lwof its intermediate part flattened as shown in Fig. 3. A suitable washer 8 is screwed on to the end opposite to the said handle 6 to hold the pin in place. This pivot pin 5 passes through a hole in'the twoears 3 and maybe manually turned therein. The tongue 4 of the upper member 2 of the press, is provided with a horizontal slot 9, said slot being just wide enough to permit the flattened portion 1 of the pin 5 to pass freely therein, and being provided at its rear end with a circular enlargement l0 wherein the pin. 5 may freely turn and whereby, when said pin is within said enlargement, the upper member 2 of the press may be freely turned as on a hinge.

Thus it will be' seen that, when the upper member 2is pulledforward, as in Fig. 1, so that the piny5 lieswithin the enlargement ll) of the slot 9, and when the pin 5 has been turned intothe position shown in Fig. 1' wherein the handle 6 thereof and the flattened part 1 are vertical, the said upper member 2 may be raised or lowered to openor close the space between the molds carried by the two members land 2; and when the pin 5 has been turned as shown in Figs. 2 and 3, so that the handle 6 and the flattened part per member 2 may he slid l are horizontal, the up horizontally rearward, said'par l of the pin then portion of the-slot 9, as

lying in the narrower shown in Figs. 2 and 3, thus removing the upper mold horizontally from the lower mold. It will also be seen that, in the first position, the upper member 2 is locked against all motion except that about the axis of the pin 5, since the pin fits the enlargement l0; and that, in the second position, in which the pin 5 has entered the narrow slot 9, the upper member 2 is locked against any movement except horizontally and longitudinally.

The base member I of the press is provided with an anvil I I, having a dove-tailed transverse slot I2 in its upper face, said slot I2 being adapted to receive the adjustable carrier l3 on which the mold I4 is secured. The position of the carrier l3 in the slot [2 is adjustably secured by means of the screw l5; thus the mold l4 may be adjusted laterally. The mold I4 is hollowed slightly on its upper face to receive the wax wad and to hold the wax pattern after it has been pressed.

The upper member 2 of the press is provided with an enlargement through which a vertical hole l6 passes, the aXis of said hole being in line with the axis of the anvil l I when the said upper member 2 is in its forward position, shown in Fig. 1. A screw-threaded shank l1 passes freely through the said hole l6 and carries at its lower end the upper anvil N3 of the press. This shank I1 is prevented from turning on its axis by means of a screw IS in the upper member 2 engaging a vertical slot 20 made in the said shank H. The. vertical position of the anvil I8 is adjusted by means of a lock nut 21 screwed on the shank l1 and engaging the lower face of the upper member 2, and by a thumb nut 22 which is screwed downward on the said shank and engages the upper face of the said upper member 2, thus clamping the said upper member 2 between the two nuts 2| and 22 and rigidly holding the upper mold in adjusted position thereon. The upper anvil i8 is provided with a longitudinal dovetailed slot 23 in its lower face, said slot being adapted to receive the adjustable carrier 24, to the lower face of which the upper mold 25 is attached. This upper mold 25 is provided with a fiat lower faceand with a longitudinal slot 26 in its lower face and extending inward from its front edge, said slot 26 being undercut in the desired form to make the key or ridge of the wax pattern above mentioned. The position of the carrier 24 in the slot 23 is adjustably secured by means of a screw 21 passing through the anvil I8 and engaging the said carrier. Thus it will be seen that the upper mold 26 may be adjusted Vertically by suitably turning the nuts 2| and 22, and longitudinally by suitable adjustment in the slot 23. Therefore the two molds l4 and 25 may be brought into proper alinement by the longitudinal adjustment of the upper mold and the transverse adjustment of the lower mold.

My apparatus is used in the following manner, the parts being first in the positions shown in Fig. 1:-The upper member 2 is raised and a sheet or wad of wax 28 is placed in the hollow upper face of the lower mold I4, then the upper member 2 is brought down on the said wax and sufficient pressure is applied thereto to cause the wax to enter the slot 26 in the upper mold to form the wax ridge or key 29 and to conform with the shape of the lower mold. Then the handle 6 is turned downward into the horizontal posi tion shown in Fig. 2 and the upper member 2 is slid rearward so that the mold 25 is slid off of the top of the wax 28, the key 29, formed on the wax during the pressure operation, passes out of the slot 26. The wax pattern, thus formed, may then be removed from the mold l4 and is ready for use to form the plaster mold in which the gold backing is to be cast.

aovasso It is, of course, understood that many va'ria tions of the above described apparatus may be made without departing from the spirit of my invention, as outlined in the appended claims, and that all equivalents of the elements thereof are to be included in the interpretation thereof.

Having, therefore, described my invention, what I claim and desire to secure by Letters Patent, is:-

1. An apparatus for molding wax patterns, comprising a base memberg a lower mold carried thereby; an upper member; an upper mold carried thereby; means for hingedly securing the two said members together; means for releasing said members from said hinged relation; and means for guiding said upper member in a relative horizontal longitudinal sliding movement between said members when said hinge means is released.

2. An apparatus as set forth in claim 1, wherein said lower mold is mounted in a transverse slot in said base member, and is transversely adjustable therein.

3. An apparatus for molding wax patterns, comprising a base member: a lower mold carried thereby; an upper member; an anvil carried by said upper member; an upper mold carried thereby; means for hingedly securing the two said members together; means for releasing said members from said hinged relation; and means for guiding said upper member in a relative horizontal longitudinal sliding movement between said members when said hinge means is released.

4. An apparatus as set forth in claim 3, wherein said upper mold is mounted in a longitudinal slot in said anvil, and is longitudinally adjustable therein.

5. An apparatus as set forth in claim 3, wherein said upper and lower molds are relatively transversely and longitudinally adjustable.

6. An apparatus as set forth in claim 3, wherein said anvil is mounted on a vertical shank clamped to said upper member and is vertically adjustable thereon.

'7. An apparatus as set forth in claim 3, wherein said means for hingedly securing said two members together comprises a pair of vertical parallel ears on said base members, a tongue on said upper member mounted between said ears, and a pin passing through said ears and tongue.

8. An apparatus for molding wax patterns, comprising a base member; a lower mold carried thereby; an upper member; an upper mold carried thereby; a pair of vertical parallel ears on said base member; a tongue on said upper member mounted between said ears; a narrow slot in said tongue; a circular enlargement of said slot at one end thereof; and a horizontal pin passing through said ears and fitting said enlargement and adapted to act as a pivot whereon said upper member may turn to vertically separate said molds, said pin being manually turnable in said ears and being flattened to permit it to relatively move in the narrow slot when thus manually turned, whereby said upper member may be slid horizontally relatively to the base member.

CLARENCE R. PERKINS. 

